Seam-calking device



July I, 1930. B. T. KEHOE SEAM CALKING DEVICE Filed July 9, 1925 5 Sheets-Sheet l INVETOR 7 M ATTORNEYS July 1, 1930. B. T. KEHOE 'SEAM CALKING DEVICE Filed July 9, 1925 3 Sheets-Sheet 2 ffi INVENTOR BY 7 ATTORNEY- Patented July 1, 1930 pair .BAsrL- ,T. KEHOE, or BARBERTON, OHIO,

ASSIGNOR TO THE 'IBAIBGOCK & WILGOX COMPANY, OF BAYONNE NEW' J ERSEY A CORPGRATION OF NEW JERSEY 'VSEAM-CALKING DEVICE Application filed .J'izly 9,

1925. Serial No. 42,383.

My invention relates to a device for calkdisposed-bevel gears 2626, both of which ing the seams of boilers and the like, as, for example, the seams formedby the butt straps and the boiler shell proper and will best be understood by reference .to the accompanying detailed description and annexed drawings in which Figure 1 is an .elevational view of an illustrative embodiment of myinvent-ion showin flsame within a boiler drum; Fig. 1

7 is an enlarged view of a detail and is taken on line 1-1 of Fig. 1; Fig. 1 is a section along line 22 of Fig. 1; Fig. 2 is a view seen from the right of Fig. 1; Fig. 3 is a sectional view taken centrally ot-the device along line 33 of Fig. 1;-and Fig. 4 isa view taken on sec- .tion .%4 of Fig.

Referring to the drawings by characters of reference-10 denotes generally a carriage or supporting member mounted within the shell 11 of a boiler drum and having opposite wheels 1212 engaging opposite edges of a butt strap 13 of boiler shell 11. Mounted centrally of the carriage 10 is an upright supportlat bored to accommodate a threaded shaft 15. Fig. 3). In threaded engagement withlshait 15 is a collar 16 which is seated upon support 14, collar 16-having a bevel gear at its top engajged'by a pinion 17, journalled' in an arm 17 'on carriage 10 and having a nut 17 Shaft 15 may be held in adjustedpositionby a set screw 19. Byturning I pinion 17,-shaft 15 maybe raised or lowered.

As best shown in Fig. 1, theupper extremity of shaft 15 supports ahorizontally ex- :tending arm 20 at the mid-section thereof. Suspended from each end of arm20 through machanism to be described in a pneumatical- -Lly-operatedhammer21 having a calking tool ,22 directed at the properangle against the :longitudinal edge of strap 13. The means by" which ,each'hammer 21 is supported and .the mechanism foradjustingzthe position of :the hammers to accommodate different sized drums and butt straps, will now be described.

- Pivotedat each end ofar'm20 is a lever 23 havingone end formed of asegment 23 of a worm wheelwengaged by a horizontally disposed worm 2 ijournalled-in a supporting framework 25 also carried upon arm 20. The.

shafts of wormsg2terminate in oppositely are engaged by a single bevelled gear 27 journalled in an upstanding member 28 and terminating in a squared shank 29 "for a wrench or crank. By turning gear- 27, both worms-24 will be simultaneously rotated but in opposite directions, and, since the direction of the threadsot worms 24 is the same,levers 23 will .berot-ated in opposite directions. Eachlever 23 is 3' oined at its opposite extremity through 50 a pin or pivot 30 to a bell crank 31 having an oti'set portion 31*. Removably mounted in each bell crank 31 is oneof the air hammers 21 previously mentioned.

Means are provided for adjusting the angular positionof a bell crank 31 withrei'er ence to a lever 23 joined thereto. To accomplish this I have provided a composite rod 35 having reversely threaded portions 36 and 37 each of which engages in threaded rela- .70 tionship a block 38 pivoted to the ofi-set portion 31 of a bell crank 31. It will be apparent that, when rod 35 is rotated, the blocks' 38 will be movedeither toward oraway fromone another and that such movement will cause, ,75 the bell cranks 31 to rotate about pivots-.30. This motion.com-binedwith the motionofthe levers 23 fixing in a general waysthe .horizontal positionofthe pivots 30 and the .up and down motion of supportingarm 20 pro- .duced by the turning of collar 16, fixing the general vertical position of said pins, permit adjustment of the position of .calking tools 22, not only .to accommodate different sized straps, but also to vary .withprecision the inclination ofsuch'tools. It is desirable that means behadproviding for the too-ls 22 yielding slightly from their adjusted position to accommodate irregularities in the width ofthe buttstrap to be oalked. Such means I have shown connectingopposite sections 36 and 37 of rod .35. As shown in Figs. 1, 1 and 1", the innerends of rod sect-ions 36 and 37 areexpandedinto heads 36 and 37- respectively, which are bothcon- .95

.tained in a shell 39 the middle portion 39 of the exterior of which may beof hexagonal shape so as to receive a .wrenchor the like. Longitudinal keyways 40, 40 are cut in heads 36? and 37 each of which receives a flat, e1onated U-shaped key 40'. The legs 40 of the -shaped keys 40 pass through holes in shell 39. A collar 41 threaded to the interior of shell 39 holds the latter in place. A spring 42 tends to press apart the opposing heads 36 and 37. Thus turning shell .39 turns bothsections 36 and 37 of rod 35 which sections however are free to move toward one another against spring 42.

As previously stated, the wheels 12 of carriage T are arranged to engage the longitudinal edges of the butt strap 13 and hence serve as a guide for the carriage and to keep the calking tools 22 in their original position. The means of adjust-ing the gauge of the carriage to accommodate dilferent sized butt straps is shown in Figure 4 and consists of guidewa s 43 to which are bolted bracket members in which are journalled wheels 1 12. The bolts 45 pass through slots 46. By

loosening bolts 45 brackets 44 carrying the Wheels 12 may be moved along guideways 43 and the desired adjustment obtained.

Compressed air is supplied through a flex- -u ible hose 47 provided with a valve 48 and connected to a transversely extending pipe 48 which is in turn connected at either end to the hammers 21 by means of flexible conduits 49-49. The air hammers 21 are of a no type standard in this art and, since their construction forms no part of the present invention, they have not been described in detail.

, In use, the calking device is placed within the boiler drum conveniently by being lifted s; by suitable means engaging eye 50 in frame 25, the drum 11 being first disposed so as to bring a strap 13 in lower horizontal position.

Previously, the gauge of carriage or, truck "10 has been adjusted so that the wheels of g the latter just straddle the butt strap 13. The

device having been placed within the drum,

position of hammers 21 is regulated, if necessary, by means of each of the three ad- ;gstments described, i. e. by turning shank 45 causing a rotation of the worm segments 23, by turning rod 35 to adjust the angular ositionsof bell cranks 31 about pivots 3O and, by turning nut 17 to regulate the height of transverse arm 20. By means of these ad- 50 justments the proper position of the calking tools 22 can be obtained with great accuracy.

" The carriage is then'attached'to means for drawing the same through the drum at a .constant rate, such means comprising a flex- "i'ble cord 51 attached to carriage 10 by ahook 52 assing through an eye 53 therein, cord 51 eading to a small motor driven Windlass (not shown) outside the drum. After cord 51 has been thus attached the air hammers B0 are set in operation by opening air valve 48 and the movement of the carriage begun by starting the motor operating the windlass drawin in cord 51.

It wi l-thus be seen that my device is en- 68 *tirely automatic in its operation, thereby displacing hand methods which have been customary practice. My improved device achieves many advantages over hand methods of calking the boiler seams. In hand calking the reaction of the air hammer is taken up by the arms and body of the operator, making the work extremely fatiguing and limiting the size of the hammer and the pressure of the air which can be used. In addition, the nature of the work requires the operator to assume a cramped position. Moreover should the angle at which the hammer is held be varied materially (an event which is likelyto happen due through fatigue and carelessness on the part of the operator) serious damage to the strap and drum may result.

It will further be observed that by mounting a pair of hammers opposite one another all horizontal components of the reaction will be neutralized, thereby insuring stability of the carriage.

It will be understood that the specific device which has been described in the foregoing is illustrative only and that the same may be widel varied without departing from the spirit 0 myinvention.

I claim 1. In a seam calking device, a carriage having guiding means adapted to contact with s the butt strap of a boiler drumto maintainthe carriage in alignment with said strap and means on said carriage for directing a calking tool against thelongitudinal edge of the strap, said guiding means being adjustable transversely of the strap and means for bringing and maintaining said tool in a calking position for different widths of straps and drum sizes, said last named means including means for maintaining said tool in a calking position including a pivoted holding arm for said tool, means for adjusting said arm around said pivot, means adjusting the position of said pivot both horizontally and vertically.

2. In a seam calking device, a carriage, a pair of calking tools mounted upon said carriage, means for adjusting the distance between said tools, and pointing them indifferent directions, and means for simultaneously raising and lowering said tools.

3. In a seam calking device, a carriage, a pair of calking tools mounted upon said carriage, means for adjusting the distance between said tools and pointing them in different directions, and means for simultaneously raising and lowering said tools, said first named means comprising worm screws and segments.

4. In a butt strap calking device, a carriage, a pair of vibrating calking tools carried b said carriage, means for directing one 0 said tools against one edge of said strap and the other tool against the opposite edge of said strap, and means for simultaneously operating said tools, whereby the opposing components of the reactions of said tools are balanced.

5. In a butt strap calking device, a carriage, a pair of calking tools carried by said carriage, one of said tools being located on one side of said strap and the other tool located on the opposite side of said strap, and means for varying the distance between said tools to accommodate straps of different Widths, said tools being opposite one to the other whereby opposing reactions of said tools may be balanced.

BASIL T. KEHOE. 

